kvm: Make init_rmode_identity_map() return 0 on success.
In init_rmode_identity_map(), there two variables indicating the return
value, r and ret, and it return 0 on error, 1 on success. The function
is only called by vmx_create_vcpu(), and ret is redundant.
This patch removes the redundant variable, and makes init_rmode_identity_map()
return 0 on success, -errno on failure.
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5de0d7b..6ffd643 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3963,25 +3963,23 @@
static int init_rmode_identity_map(struct kvm *kvm)
{
- int i, idx, r, ret = 0;
+ int i, idx, r = 0;
pfn_t identity_map_pfn;
u32 tmp;
if (!enable_ept)
- return 1;
+ return 0;
/* Protect kvm->arch.ept_identity_pagetable_done. */
mutex_lock(&kvm->slots_lock);
- if (likely(kvm->arch.ept_identity_pagetable_done)) {
- ret = 1;
+ if (likely(kvm->arch.ept_identity_pagetable_done))
goto out2;
- }
identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT;
r = alloc_identity_pagetable(kvm);
- if (r)
+ if (r < 0)
goto out2;
idx = srcu_read_lock(&kvm->srcu);
@@ -3998,13 +3996,13 @@
goto out;
}
kvm->arch.ept_identity_pagetable_done = true;
- ret = 1;
+
out:
srcu_read_unlock(&kvm->srcu, idx);
out2:
mutex_unlock(&kvm->slots_lock);
- return ret;
+ return r;
}
static void seg_setup(int seg)
@@ -7756,8 +7754,8 @@
if (!kvm->arch.ept_identity_map_addr)
kvm->arch.ept_identity_map_addr =
VMX_EPT_IDENTITY_PAGETABLE_ADDR;
- err = -ENOMEM;
- if (!init_rmode_identity_map(kvm))
+ err = init_rmode_identity_map(kvm);
+ if (err)
goto free_vmcs;
}